Chair-iron.



H. G. HfiUNN.

CHAIR mom. I APPLICATION FILED APR-16,1918,

1277326. Patented Sept.- 3, I918.

INVENTOR A TTORIVEY m; nonms FEYERS co.. nnomuruunwzsumcmm g c HOWARD G. l-IUNN, OF CHICAGO, ILLIINOIS CHAIR-IRON.

Specification of Letters Patent.

A licationfiled. apriue, 19 18. seriarlio.228,821.

and simplified means for firmly retaining the back in adjusted posltion; I V

Stated in general terms, the invention comprises mechanism in the nature of awedge, or a plurality of Wedges, for locking the chair back in vertically and angularly adjusted position.v

The preferred embodiment of the invention is illustrated in the accompanying drawing, wherein- V Figure 1' is aside elevational view' of a fragment of a chair to which my invention is applied;

Fig. 2' 1s a top plan view, withthe seat omitted, the'b'ack supporting standard ap pearing'in section, and a portion of the main wedge block-being broken away," v

Fig. 3' "s' a perspective view' ofthe main wedge block and oneof the wedgling jawsin cooperative position; and

Fig. 4 is a, broken sectional line of Fig; 21 v J In the drawing, 1 0 denotes the spindle or rod to which the arms ll are attached which support the chair seat 12. The back view on the rest is designated 13 and is secured to the back-rest-support .or standard 14. It isof practical advantage to' ha ve the rest 13 rigidly attached to its support 14, and to effect adjustment of the rest 1'3', both vertically and angularly, by movement of the support 14 and my invention is adapted to accom-' plish this purpose. v v 7 Supported from and" eitending rearwardly of the spindle 10 is" a pair of oppositely disposed bracketarms- 15, which conadjustment of the chair back, and its principal object. is to provide effective verge and are turned upwardly at their rear ends. Near such rear ends the arms 15 are provided with alined openings'to' receive a pintle 16 which serves to hold the main wet e block denoted generally by thenu- Ine'ral 17 between the arms 15. The wedge.

block 17 near its forward end is provided with a transverse opening through a hub;

18 into which the pintle 16 passes with a loose friction fit. The sides of the wedge block 17 are taperingly cored out as at 19 to accommodate the. rear ends of the arms Patented Sept. a, 918.

15', which are shaped to snugly enter the CflVltlBS 19, and thus'holdthe' block 17 rigidly on the pintle 16.

The rear end with'the similar fluted, 0r toothed wedge faces 20 and 21, each curved in the arc of a circle, and oppositely inclined at an angle from the. approximately middle dividing line'22.

Pivotally supported on the pintle 16, is a frame which comprises the side arms 23 and 24,v a cross piece 25, and thefianges 26 turned 7 at a right angle to the arms 23 and 24. V The arms 23 and 24 are parallel to and outside of the arms 15, and the flanges 26 overlie the inner or rear ends of the ar'ms 15.

The side arms 23 and 24 of the frame'are provided near their rear ends with alined openings to receive hubs on wedge jaws through'which a threaded spindle 27 passes, and at one end the spindle is smooth and has a hand wheel 28 attached thereto by means of the pin29. The spindle 27 may be rotated inv either direction through the afgencyof the wheel 28.

. Loosely mounted on the threaded portion ofthe spindle 27 is a pair of wedge jaws 80, 7

each of which is substantially T-shaped, as clearly shown in Fig. 2. The spindle passes through the jaws at a point in the stem adjacent the head of the jaw, andthe open ing in the jaw through which the spindle passes is screw threaded-in correspondence with the threads of the spindle 27. Secured to the outer face of each jaw 30 in alinement with the opening therethrough, is an annu-f lar hub 31 which bears in the openings in the, side arms 23 and 24, and which hubs are also internally threaded to be engaged by the'threads on the spindle 27. e; The outerfacets of thehe'a'dof each jaw 30 is beveled,

of the block 17 is provided,

adjustment of the standard for a purpose to be presently described, and the base 33 of the stem of each jaw is toothed and curved in the arc of a circle to conform to the configuration of the rear end of the wedge block 17. One of the jaws 30, for eX- ample that shown at the upper portion in Fig. 2 is capable of moving along the spindle for practically itsentire threaded length, while the range of movement of the other jaw along thespindle is very small, being limited by a cross pin. 34 extending through the spindle adjacent the'inner face of this latter jaw. I j

As will be noted from Fig.2, oneface of the standard letis arched, so that its two inclined sides 14? are adapted to be engaged by the beveled'faces 32 of the jaws 30, while the other face of the standard is provided with the oppositely disposed undercut grooves 14 into which the rear hooked ends 23 and 24 of the arms 23 and 24 are adapted to engage. i

'The operation of the device, is as follows:-lVith the parts assembled as shown in Fig. 2, the hand wheel 28 is turned in one direction, say toward the right, forcing the wedge aws 30 toward each other and causing them to rideup on the inclined curved faces 20 of the wedge block17'. The movement of the wedge jaws toward each other causes their beveled faces 32 to wedge against the arched sides 14* of the standard 14, thus clamping the latter firmly in position. The toothed faces 33 of the jaws 30 interlock with the toothed faces 20 of the wedge block and the parts are all thus rigidly interlocked. If it be desired to effect adjustment of the back rest 13 in'a vertical direction only, the hand wheel 28 is turned to the left just a sufficient distance to allow of the standard 14 being moved up and down, and when this vertical adjustment is made, the hand wheel is again turned toward the right and the standard clamped in adjusted position. If backward or forward adjustment of the rest 13 is desired, say to the position indicated in dotted lines in Fig. 1, the hand wheel 28 is rotated toward the left sufliciently to permit of the toothed faces 33 of the wedge jaws 3 0 riding freely over the toothed faces 20 of the block 17. The frame 23,25 is then moved.

in the arc ofa circle until the rest 13 is in the deslred position of adjustment, and the hand wheel 28. thereupon again turnedto the right until the parts are firmly interlocked.

From the foregoing description of g theconstruction and operation of the device it will be noted that both vertical and angular leis controlled from the hand wheel 28, thus making it necessary-to manipulate only one rotary member in adjusting the chair back, thereby conducing to simplicity and ease of handling.

I desire it to be understood that thedetails of my invention are susceptible ofqconto engage said wedge faces, a standard engageable by a part of said jaws, and means for controlling relative movement between the block and the jaws. I

2. A chair iron, comprising a wedge block having wedge faces receding from the middle line of said block, wedge jaws having portions capable of engaging with the wedge faces of said block and additional portions cooperable with a standard, a standard adapted to be engaged by the last named portions of sadi jaws, and means for controlling relative movement between the block and the j aws.

3. A chair iron, comprising a relatively fixed wedge blockhaving wedge faces receding from. the middle line of said block, wedge jaws movable in relation to said block and engagcable with the wedge faces thereof, a standard engageable by a part of said jaws and means for controlling the movement of said jaws in relation to said block.

4;. A chair iron, comprising a wedge block, wedge jaws cooperable therewith, means for effecting relative movement in the arc of a circle between said jaws and said block, means for effecting reciprocal movement of said jaws,'and a standard engageable by a part of said jaws.

5. A chair iron, comprisinga relatively fixed wedge block, pivotally mounted wedge jaws movable in the arc of a circle in relation to said ;block, means for moving said jaws toward and from each other, and a standard engageable by part of said jaws.

6. A chair iron, comprising a wedge block having a toothedface, wedge jaws having toothed portions cooperablewith the toothed face of said block, a standard engageable by a portion of said jaws, and means for controlling relative .movement between said jaws and said block.

7. A chair iron, comprising a wedge block, wedge jaws cooper-able therewith and having beveled faces, a-standard having an arched portion engageable by the beveled faces of said wedge jaws, and "means for controlling relative movement between the block and the aws. i

8. A chair iron, comprising a wedge block having a toothed face, wedge jaws having toothed faces cooperable with the toothed face of said block, said jaws also having beveled faces, a standard having inclined faces engageable by the beveled faces of said jaws, andmeans for moving said jaws toward and from each other.

9. A chair iron, comprising a wedge block,

ing a toothed wedge face curved in the arc of a circle, wedge jaws having toothed faces curved in the are of a circle and cooperable with the wedge face of the block, beveled heads carried by said jaws, a standard having inclined faces cooperable with the beveled heads of said jaws, and means for controlling the movement of said jaws.

11. In a chair iron, the combination with a frame comprising arms havinghooked ends,

of a wedge block between the arms of said frame, wedge aws cooperable wlth said block and having beveled portions, a standard havlng inclined faces engageable by said beveled portions and also having parts engageable by the hooked ends of said arms, and means for controlling the movement of said wedge jaws.

12. In a chair iron, the combination with a frame comprising arms having hooked rear ends, of a wedge block between the arms of said frame, a pivot in said wedge block about which said frame is adapted to rock, a pair of wedge jaws reciprocable toward and from each other in said frame, said jaws having beveled heads, a standard having an inclined front face engageable by the beveled heads of the jaws and undercut grooves in its rear face engageable by the hooked ends of said arms, and means whereby said block, jaws and standard may be locked together or freed from one another.

In testimony whereof I have afiixed my signature.

HOWARD e. HUNN.

Copies of this patent rnay be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. 0. 

